Fish Catcher vs Netcraft
Comparison
Fish Catcher checks pages on your device and tells you in plain words why one looks risky. The Netcraft extension checks each site against Netcraft’s servers and feeds its takedown operation.
Where your data goes
Side by side
 Fish Catcher |  Netcraft | |
|---|---|---|
| Privacy | Checks stay on your device | Site address sent to Netcraft |
| Open source | MIT licensed, code on GitHub | Closed source |
| Blocks or warns | Warns, never blocks | Warns, blocks known bad sites |
| How it detects | On-device signals plus daily blocklist | Cloud lookup plus takedown team |
| Cost | Free, no account | Free browser extension |
| Best for | Private warnings with plain reasons | Wide coverage of reported sites |
Competitor details are from their public documentation as of August 2026; tell us if something changed. Logos belong to their owners and are shown to identify the products.
Which to pick
Pick Fish Catcher if
- You want nothing about your browsing sent to a third party.
- You want the reason behind every warning, in plain words.
- You want code you can read and no account to create.
Pick Netcraft if
- You want the widest coverage of freshly reported phishing sites.
- You want a human team behind the feed, taking sites down.
- You are fine with each site address being looked up in the cloud.
Where Fish Catcher is weaker
- It is new. Netcraft has years of operating history.
- Its blocklist is smaller, so a freshly reported site can reach Netcraft’s feed first.
- It only warns. It will not stop a page from loading.
- There is no takedown operation behind it. It protects you; it does not remove the site.
Common questions
Can I run Fish Catcher and Netcraft at the same time?
Yes. You may see two warnings on the same site; read whichever reason is clearer.
Does Fish Catcher send the sites I visit anywhere?
Not by default. If you turn on the optional Safe Browsing layer, that one check runs with your own Google key.